Enable art MTS tests to generate android-mts-art as well as be included in android-mts.

Test: build locally and verified contents.
Change-Id: Iaffaa77fab13974242d576bb8133dcc4fb3f9454
Merged-In: Iaffaa77fab13974242d576bb8133dcc4fb3f9454
Exempt-From-Owner-Approval: approved in internal branch.
diff --git a/test/Android.bp b/test/Android.bp
index 5a458d2..e81645e 100644
--- a/test/Android.bp
+++ b/test/Android.bp
@@ -228,7 +228,7 @@
     },
     test_suites: [
         "general-tests",
-        "mts",
+        "mts-art",
     ],
     host_required: [
         "art-run-test-checker",
@@ -1025,7 +1025,7 @@
     // It seems that only device-tests build can create a valid apex.
     test_suites: [
         "device-tests",
-        "mts",
+        "mts-art",
     ],
     test_config: "art-gtests-target-install-apex.xml",